JPS63131864A - Control device for internal combustion engine - Google Patents

Abstract

PURPOSE:To automatically keep the rotating speed of an engine constant by connecting both a driving and a charging circuit in parallel to a commercial power source to make a starter and an ignitor function on common power source and moreover improve the startability of the engine. CONSTITUTION:The driving circuits 16, 17 of a starter and the charging circuit 2 of an ignitor are connected in parallel to a commercial power source 1. Thus a common power source becomes applicable to make a battery unnecessary. In addition to that, since the rotating speed of an engine is low even when the actuation of the starter causes voltage drop in the commercial power source 1, charging time for the capacitor 6 of an ignitor becomes longer to make its sufficient charging possible for the smooth starting of the engine. At the time of normal engine running, the charging time for the above-mentioned capacitor 6 becomes shorter, but the voltage drop in the power source does not occur. A sufficient charging current can be therefore supplied, end the charging current supplied through the charging circuit 2 from the commercial power source at the over speed of the engine keeps constant without its increase. Thus the charging voltage for the capacitor 6 lowers to cause impossible ignition, and thereby the engine can be automatically adjusted to its constant rotating speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for an internal combustion engine that includes a starter device and a non-contact ignition device.

(Prior Art) An internal combustion engine uses city gas as fuel, and is sometimes used as a power source for driving a heat pump device, for example. When a heat pump is driven by an internal combustion engine in this way, it can be started smoothly and the rotational speed is controlled so as to be always constant due to issues such as operational efficiency.

For this purpose, a starter is provided, which forcibly rotates the crankshaft, and the ignition timing signal generated by the rotation of the crankshaft converts the charge in the capacitor of the ignition device into conduction of the thyristor, which is a semiconductor switching element. As a result, a discharge is caused to the primary side of the ignition coil via the thyristor, and an ignition spark is generated at the ignition plug by the high voltage induced on the secondary side of the ignition coil.

(Problems to be Solved by the Invention) By the way, if a battery is used as a power source to drive the starter, or if a special control device is provided to control the rotational speed of the internal combustion engine to be constant, costs will be reduced accordingly. Bulk. Therefore, the starter can be operated without using a special battery.
Furthermore, there is a need for a control device for an internal combustion engine that has a simple structure and can keep the rotational speed constant.

This invention was made in view of the above circumstances, and it uses a common power source for the starter and the ignition device, and also provides the ignition device with improved starting performance and a starter that can automatically maintain a constant rotation speed. An object of the present invention is to provide a control device for an internal combustion engine, which includes a device and a non-contact ignition device.

(Means for Solving the Problem) In order to solve the above-mentioned problem, the present invention provides a starting device that forcibly rotates the crankshaft using electric power supplied through a drive circuit, and a charging circuit. A non-contact ignition device that charges a capacitor with a supplied charging current and discharges the charge in the capacitor with a semiconductor switching element operated by an ignition timing signal to generate an ignition voltage on the secondary side of an ignition coil. The engine control device is characterized in that the drive circuit and the charging circuit are connected in parallel to a commercial power source.

(Operation) In the present invention, a charging current is supplied from a commercial power supply through the charging circuit of the ignition device to charge the capacitor. Further, driving power is supplied to the starter device via a drive circuit connected to the commercial power source in parallel with the charging circuit, and the starter forcibly rotates the crankshaft to generate an ignition timing signal. Then, the charge in the capacitor is discharged by the semiconductor switching element, and an ignition voltage is generated in the ignition coil.

Even if the power supply voltage of the ignition device drops during the low rotation speed of starting, the capacitor is sufficiently charged because the charging time is long.

Furthermore, although the charging time is shorter during normal operation, sufficient charging current is supplied because there is no power supply voltage drop like there is during startup. Moreover, when overspeeding occurs, the charging current supplied through the charging circuit is constant regardless of the rotational speed, so the charging voltage of the capacitor decreases, resulting in a misfire and the rotational speed decreases. becomes constant.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

The primary side of a transformer 3 constituting the charging circuit 2 of the non-contact ignition device is connected to the commercial power supply 1, and the full-wave rectifier 4 is connected to the secondary side of the transformer 3. The alternating current is full-wave rectified by a full-wave rectifier 4. The direct current obtained by the full-wave rectifier 4 is supplied via a limiting resistor 5 to charge a capacitor 6. Limiting resistor 5 is connected to transformer 3 during charging.
and limits the charging current flowing to the full-wave rectifier 4. The primary side of an ignition coil 7 is connected to the capacitor 6, and the spark plug 8 provided in the combustion chamber of an internal combustion engine that uses city gas as fuel is connected to the secondary side. The operation of this internal combustion engine drives the heat pump device.

The anode side of a thyristor 9, which is a semiconductor switching element, is connected between the limiting resistor 5 and the capacitor 6, and the cathode side is grounded.

Further, a control circuit 10 is connected to the gate of the thyristor 9, and an ignition timing signal generating coil 12 is connected to the control circuit 10 via a waveform shaping circuit 11. The ignition timing signal generating coil 12 is composed of, for example, a balsa coil, and outputs an ignition timing signal according to the rotation angle of the crankshaft from a rotating body 13 that rotates in synchronization with the crankshaft of the internal combustion engine. .

The internal combustion engine is equipped with a starting device, which has a starter pinion insertion device 14 and a starter motor 15 . The starter pinion insertion device 14 operates a pinion (not shown) to transmit starter power to the crankshaft.

Starter pinion insertion device 14 and starter motor 15
The drive circuits 16, 17 are each connected to the commercial power supply 1 and are in parallel with the charging circuit 2 of the ignition device. Each drive circuit 16.17 is equipped with a switch 18.19 and a gold wave rectifier 20.21.

Next, the operation of this embodiment will be explained.

Ignition device charging circuit 2 and starting device drive circuit 16.17
When connected to the commercial power supply 1, the alternating current of the commercial power supply 1 is made to a predetermined voltage by the transformer 3 of the charging circuit 2, and further rectified into direct current by the full-wave rectifier 4. This rectified charging current charges a capacitor 6 via a limiting resistor 5.

When starting the internal combustion engine, first, when the switch 18 of the starter pinion insertion device 14 is closed, the alternating current from the commercial power supply 1 is supplied via the full-wave rectifier 20 as a direct current. As a result, the starter pinion insertion device 14 is driven, and the power of the starter motor 15 can be transmitted to the crankshaft.

Then, when the switch 19 of the starter motor 15 is closed, alternating current from the commercial power source 1 is supplied via the full-wave rectifier 21, and the starter motor 15 is driven. The drive of the starter motor 15 forcibly rotates the crankshaft of the internal combustion engine. When the rotating body 13 is rotated by this crankshaft, an ignition timing signal is output from the ignition timing signal generating coil 12 and transmitted through the waveform shaping circuit 11! Control circuit 10
is input. The control circuit 10 makes the thyristor 9 conductive at the timing when the ignition timing signal is input from the waveform shaping circuit 11, and the conduction of the thyristor 9 causes the capacitor 6 to become conductive.
The charged charge is discharged to the primary side of the ignition coil 7 through the thyristor 9, a high voltage is generated on the secondary side of the ignition coil 7, and an ignition spark is generated at the ignition plug 8.

Then, due to the discharging current of the capacitor 6, when the discharge is completed, the capacitor 6 is charged to a polarity opposite to that shown in the figure and then discharged again in the reverse direction. Therefore, a reverse voltage is applied to the thyristor 9, and the thyristor 9 is turned off.

At this time of starting, a voltage drop of the commercial power supply 1 occurs due to the drive of the starter pinion insertion device 14 and the starter motor 15, but since the internal combustion engine is rotating at a low speed at this time, the conduction time interval of the thyristor 9 is long, and the capacitor 6 is charged to a predetermined voltage. Therefore, even when the starting device is driven, there is no shortage of charging current to the capacitor 6 of the ignition device, and the internal combustion engine can be started smoothly.

When the internal combustion engine is operating, the charging current supplied from the charging circuit 2 of the ignition device is constant regardless of the rotational speed of the internal combustion engine, but when the rotational speed exceeds a predetermined rotational speed, the output interval of the ignition timing signal is shortened accordingly. Since the charging time of the capacitor 6 becomes shorter, the voltage generated on the secondary side of the ignition coil 7 becomes lower, and a spark with the energy necessary for ignition is not generated in the ignition plug 8, which may cause the internal combustion engine to misfire. can be,
Due to this misfire, the rotational speed is reduced to a rotational speed at which the capacitor can be charged enough to obtain sufficient ignition energy, and the engine is automatically operated at a predetermined rotational speed that prevents over-rotation.

Furthermore, since the charging current supplied from the charging circuit 2 of the ignition device is constant regardless of the rotational speed of the internal combustion engine, it is possible to install a spark plug 8 with an excessively wide spark gap between the center electrode and the ground electrode. If there is, a misfire will occur, so the spark plug 8 can be inspected.

(Effects of the Invention) As described above, this invention connects the driving circuit of the starting device and the charging circuit of the non-contact ignition device in parallel to the commercial power source, so the starting device and the non-contact ignition device share a common commercial power source. This eliminates the need for a battery to drive the starter. Moreover, even if there is a voltage drop in the commercial power supply due to driving the starter, the internal combustion engine rotates at a low speed, so the charging time for the capacitor in the ignition device will be longer, allowing the capacitor to be sufficiently charged and starting the internal combustion engine. is smooth. Also, during normal operation, the charging time is shorter, but since there is no power supply voltage drop, sufficient charging current is supplied, and when overspeeding occurs, the charging current supplied from the commercial power supply via the charging circuit remains constant and does not increase. As a result, the charging voltage of the capacitor decreases, causing a misfire, and the rotational speed is automatically adjusted to a constant rotational speed.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a control device for an internal combustion engine including a starter device and a non-contact ignition device according to an embodiment of the present invention. 1 - Commercial power supply 2 - Charging circuit 6 - Capacitor 9 - Thyristor 14 - Starter pinion insertion device 15 - Starter motor 16, 17 - Drive circuit

Claims (1)

[Claims] A starter device that forcibly rotates the crankshaft using electric power supplied through the drive circuit, and a capacitor that is charged with charging current supplied through the charging circuit, and activated by the ignition timing signal. In the control device for an internal combustion engine, the drive circuit and the charging circuit are connected in parallel to a commercial power source. Internal combustion engine control device.